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Android自定义图文跑马灯效果

2019年09月09日  | 移动技术网移动技术  | 我要评论

之前的需求是用flipperview来实现上下翻动效果，但是发现数据有点长会造成一屏幕放不下三条数据，后来改为跑马灯，但是只有文字的跑马灯textview自己就有，但是要求文字后面带一个小图标怎们办呢？

(1).mainactivity.java：

public class homefragment extends basefragment {
  private marqueescroll mmarqueescroll;
  private int[] name_tv = {r.id.name_tv1, r.id.name_tv2, r.id.name_tv3, r.id.name_tv4, r.id.name_tv5, r.id.name_tv6};
  private textview[] name_tvs = new textview[6];
  private int[] name_iv = {r.id.name_iv1, r.id.name_iv2, r.id.name_iv3, r.id.name_iv4, r.id.name_iv5, r.id.name_iv6};
  private imageview[] name_ivs = new imageview[6];
  private arraylist<homeflipperbean> mflipperlist = new arraylist<homeflipperbean>();

  @override
  public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {

    view view = inflater.inflate(r.layout.fragment_homenews, null);
    mmarqueescroll = (marqueescroll) view.findviewbyid(r.id.marqueescroll);
    for (int i = 0; i < name_tv.length; i++) {
      name_tvs[i] = (textview) view.findviewbyid(name_tv[i]);
      name_ivs[i] = (imageview) view.findviewbyid(name_iv[i]);
    }
    mmarqueescroll.run();

    // 在这里进行解析
    responsebasebean<arraylist<homeflipperbean>> responsbasebean = json.parseobject(mflipperdata,
        new typereference<responsebasebean<arraylist<homeflipperbean>>>() {
        });
    mflipperlist = responsbasebean.getresult();

    if (mflipperlist != null && mflipperlist.size() > 0) {
      // foregroundcolorspan 为文字前景色，backgroundcolorspan为文字背景色
      foregroundcolorspan span1 = new foregroundcolorspan(0xff535353);
      foregroundcolorspan span2 = new foregroundcolorspan(0xff346699);

      for (int i = 0; i < name_tvs.length; i++) {
        homeflipperbean bean = mflipperlist.get(i);
        name_tvs[i].settext(bean.getname() + " " + bean.getprice());
        if ("up".equals(bean.gettrend())) {
          name_ivs[i].setbackgroundresource(r.drawable.in_img3);
        } else {
          name_ivs[i].setbackgroundresource(r.drawable.in_img4);
        }
        int length = bean.getname().length();
        spannablestringbuilder builder = new spannablestringbuilder(name_tvs[i].gettext().tostring());
        builder.setspan(span1, 0, length, spannable.span_exclusive_exclusive);
        builder.setspan(span2, length + 1, name_tvs[i].gettext().tostring().length(),
            spannable.span_exclusive_exclusive);
        name_tvs[i].settext(builder);
      }
    }
  }
}

(2).fragment_homenews.xml：布局文件引用控件

<com.monkey.mushroom.ui.view.marqueescroll
   android:id="@+id/marqueescroll"
   android:layout_width="match_parent"
   android:layout_height="@dimen/kx_nonet_h" >

   <linearlayout
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="#e1f4ff"
     android:orientation="horizontal" >

     <textview
        android:id="@+id/name_tv1"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv1"
        style="@style/filpper_image_style" />

     <textview
        android:id="@+id/name_tv2"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv2"
        style="@style/filpper_image_style" />

     <textview
        android:id="@+id/name_tv3"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv3"
        style="@style/filpper_image_style" />

     <textview
        android:id="@+id/name_tv4"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv4"
        style="@style/filpper_image_style" />

     <textview
        android:id="@+id/name_tv5"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv5"
        style="@style/filpper_image_style" />

     <textview
        android:id="@+id/name_tv6"
        style="@style/filpper_text_style" />

     <imageview
        android:id="@+id/name_iv6"
        style="@style/filpper_image_style" />
   </linearlayout>
</com.jyd.jyddz.ui.view.marqueescroll>

(3).marqueescroll.java：自定义horizontalscrollview

public class marqueescroll extends horizontalscrollview implements runnable {
  private view inner;
  private bitmap bitmap = null;

  /**
   * 滚动步长
   */
  private int step = 1;
  private int x;
  private int width;
  private int pwidth;
  private int pheight;

  public marqueescroll(context context, attributeset attrs) {
    super(context, attrs);
    setbackgroundcolor(0xffe1f4ff);
  }

  @override
  protected void onfinishinflate() {

    if (getchildcount() == 1) {
      inner = getchildat(0);
    }

  }

  @override
  protected void ondetachedfromwindow() {

    super.ondetachedfromwindow();
    handler.removecallbacks(this);
  }

  @override
  protected void ondraw(canvas canvas) {
    if (getwidth() == 0) {
      android.view.viewgroup.layoutparams lp = getlayoutparams();
      lp.width = pwidth;
      lp.height = pheight;
      setlayoutparams(lp);
    }
    if (bitmap == null && inner != null) {
      width = inner.getmeasuredwidth();
      bitmap = bitmap.createbitmap(width, inner.getheight(), config.rgb_565);
      canvas canvas1 = new canvas(bitmap);
      inner.draw(canvas1);
      pwidth = getwidth();
      pheight = getheight();
      if (inner != null) {
        removeviewinlayout(inner);
        inner = null;
      }

      run();
    }

    if (bitmap != null) {

      int nowx = x;
      nowx -= step;
      canvas.drawbitmap(bitmap, nowx, 0, null);

      if (nowx < 0) {

        canvas.drawbitmap(bitmap, width + nowx /* + space */, 0, null);
      }
      if (nowx <= -width) {
        nowx = 0;

      }
      x = nowx;
    }
    super.ondraw(canvas);
  }

  private handler handler = new handler() {
    @override
    public void handlemessage(message msg) {

      super.handlemessage(msg);
    }

  };

  @override
  public void run() {

    invalidate();
    handler.postdelayed(this, 1);
  }
}

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